Wendy had 112 pens.
34 of them were purple pens and the rest were yellow pens. After she had given away some purple pens, the ratio of the number of purple pens to the number of yellow pens became 3 : 4. How many pens did she have in the end?
| |
Purple |
Yellow |
Total |
| Before |
3x4 =
12 u |
1x4 =
4 u |
4x4 =
16 u |
| Change |
- 9 u |
|
|
| After |
3 u |
4 u |
7 u |
The number of yellow pens remained unchanged.
LCM of 1 and 4 = 4
Total number of pens at first = 16 u
16 u = 112
1 u = 112 ÷ 16 = 7
Number of pens that Wendy had in the end
= 3 u + 4 u
= 7 u
= 7 x 7
= 49
Answer(s):49
